公开(公告)号：US20190097417A1

公开(公告)日：2019-03-28

申请号：US16106538

申请日：2018-08-21

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Dale S. Finney

IPC: H02H7/06 ,  F01D15/10 ,  G01R31/34 ,  G01R31/02 ,  H02H3/16

Abstract: Detection of electric power generator stator ground fault conditions and protection of the generator due to such conditions is provided herein. In one embodiment, a generator protection element may calculate generator third harmonic voltage quantities using measurements from the generator terminals, and determine a stator ground fault condition using the calculated generator third harmonic voltage quantity. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition.

公开(公告)号：US20250118990A1

公开(公告)日：2025-04-10

申请号：US18483032

申请日：2023-10-09

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Dale S. Finney

IPC: H02J13/00 ,  H02J3/00

Abstract: An electric power system may include numerous devices electrically connected to numerous other devices. In some cases, it may be beneficial to quickly determine and resolve an electric power system topology. Using a protection and control (PAC) algorithm, an electric power delivery system may be identified and represented as a graph including nodes and edges. The nodes represent electric power sources, busses, and ground. The edges represent circuit breakers, disconnects switches, and ground switches. By representing the electric power delivery system as a graph, the connections between various nodes (e.g., power sources, busses, grounds) and edges (e.g., circuit breakers, disconnects, ground switches) may be quickly and easily realized, represented, and visualized. Doing so may reduce programming and testing time after a change to the topology.

公开(公告)号：US20240072697A1

公开(公告)日：2024-02-29

申请号：US17823344

申请日：2022-08-30

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Matchyaraju Alla ,  Normann Fischer ,  Dale S. Finney

IPC: H02P9/00

CPC classification number: H02P9/006 ,  H02P2103/20

Abstract: The present disclosure pertains to devices, systems, and methods for monitoring a generator. In one embodiment, the system may include a measurement subsystem to receive a plurality of split-phase measurements of branch currents associated with the at least one generator. A split-phase transverse differential monitoring subsystem may receive the plurality of split-phase measurements of branch currents associated with the at least one generator and may generate an offset value representing a standing split-phase current. A protective action subsystem may generate a first protective action based on the phasor operating current.

公开(公告)号：US10797632B2

公开(公告)日：2020-10-06

申请号：US16275696

申请日：2019-02-14

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Dale S. Finney

IPC: G01R31/14 ,  H02P29/024 ,  G01R31/34 ,  G01R31/50

Abstract: Disclosed are systems and methods to determine a direction to a fault of an electrical generator using sensitive current. A ground fault is determined using voltage signals from the generator installation. Incremental residual values of the sensitive current, along with the voltage, are used to determine a direction to the fault. The generator may be high-impedance grounded. The systems and methods further indicate the direction to a fault where multiple generators are connected using a common generation bus.

公开(公告)号：US20200076338A1

公开(公告)日：2020-03-05

申请号：US16425763

申请日：2019-05-29

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Matchyaraju Alla ,  Armando Guzman-Casillas ,  Dale S. Finney ,  Normann Fischer

IPC: H02P9/00 ,  H02H7/06 ,  H02P29/40 ,  G01R31/34

Abstract: Protection devices prevent damage to synchronous generators during loss-of-field events. In various embodiments, a first protective element is associated with a first protection zone to protect a generator from a loss-of-field event at full load. A second protective element is associated with a second protection zone to prevent thermal overload during underexcited operation of the generator and to protect from loss-of-filed at light load. A third protective element associated with a third protection zone limits operation of the generator within the generator's specific steady-state stability limits. A fourth protective element is associated with a fourth protection zone to provide an alarm prior to operation of the second protective element. In various embodiments, characteristics and limits of each of the protective elements are defined in the same plane (specifically, the P-Q plane) to simplify settings and allow for visualization of the element characteristics and the generator capability curve at one or more temperatures or cooling capacities.

公开(公告)号：US09496707B2

公开(公告)日：2016-11-15

申请号：US14579573

申请日：2014-12-22

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Michael J. Thompson ,  Dale S. Finney

IPC: H02H7/06 ,  G01R31/34 ,  F01D15/10

CPC classification number: H02H7/06 ,  F01D15/10 ,  F05D2220/76 ,  G01R19/2513 ,  G01R21/001 ,  G01R31/34 ,  G01R31/343

Abstract: The present disclosure is applicable to generators with low motoring power. In one embodiment, a generator protection element may include a generator monitoring subsystem configured to measure a real power output and an imaginary power output of a generator. The system may also include an electrical parameter threshold subsystem configured to determine whether the measured real power output and the measured imaginary power output satisfy a tripping characteristic. The tripping characteristic may be defined by a function having a slope with respect to a real power axis and an imaginary power axis. In some embodiments, the function may be a piecewise function that defines a first linear segment having a first slope and a second linear segment having a second slope. The first slope and the second slope may be equal and opposite. A tripping subsystem may issue a trip command based upon satisfaction of the tripping characteristic.

Abstract translation: 本公开适用于具有低电动机功率的发电机。 在一个实施例中，发电机保护元件可以包括被配置为测量发电机的有功功率输出和虚功率输出的发电机监控子系统。 系统还可以包括电参数阈值子系统，其被配置为确定测量的有功功率输出和测量的虚功率输出是否满足跳闸特性。 跳闸特性可以通过相对于实际功率轴和虚拟动力轴具有斜率的函数来定义。 在一些实施例中，该功能可以是限定具有第一斜率的第一线性段和具有第二斜率的第二线性段的分段函数。 第一斜坡和第二斜坡可以相等和相反。 跳闸子系统可以基于跳闸特性的满足来发出跳闸命令。

公开(公告)号：US20160025811A1

公开(公告)日：2016-01-28

申请号：US14807339

申请日：2015-07-23

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Bogdan Z. Kasztenny ,  Normann Fischer ,  Dale S. Finney ,  Douglas I. Taylor

IPC: G01R31/34 ,  H02H7/06

CPC classification number: G01R31/343 ,  H02H3/083 ,  H02H7/06

Abstract: Protection of an electrical generator includes determining a rotor and stator components using rotor and stator electrical signals, calculating a unbalance and/or differential component using the stator and rotor components, and determining a stator or rotor fault based on the unbalance and/or differential component. Further, the faulted phase and/or zone of a stator fault may be determined using the stator positive sequence voltage and negative sequence current.

Abstract translation: 发电机的保护包括使用转子和定子电信号确定转子和定子部件，使用定子和转子部件计算不平衡和/或差动部件，以及基于不平衡和/或差动部件确定定子或转子故障 。 此外，可以使用定子正序电压和负序电流来确定定子故障的故障相位和/或区域。